Thermo Fisher Scientific Inc.
MX ˙ BMV ˙ US8835561023
SecurityMX:TMO / Thermo Fisher Scientific Inc.
InstitutionDiamond Hill Capital Management Inc
Latest Disclosed Ownership360,652 shares
Latest Disclosed Value $ 177,271,278
Diamond Hill Capital Management Inc reports 21.65% decrease in ownership of TMO / Thermo Fisher Scientific Inc.

On May 7, 2026 - Diamond Hill Capital Management Inc filed a 13F-HR form disclosing ownership of 360,652 shares of Thermo Fisher Scientific Inc. (MX:TMO) valued at $177,271,278 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 460,301 shares of Thermo Fisher Scientific Inc.. This represents a change in shares of -21.65% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F Thermo Fisher Scientific COM 883556102 360,652 -99,649 -21.65 177,271 -33.54 1.1088
2026-02-06 2025-12-31 13F Thermo Fisher Scientific COM 883556102 460,301 -39,639 -7.93 266,721 10.00 1.3667
2025-11-05 2025-09-30 13F Thermo Fisher Scientific COM 883556102 499,940 499,940 242,481 1.1512
2021-02-08 2020-12-31 13F Thermo Fisher Scientific COM 883556102 0 -2,529 -100.00 0 -100.00
2020-11-09 2020-09-30 13F Thermo Fisher Scientific COM 883556102 2,529 -491,241 -99.49 1,117 -99.38 0.0062
2020-08-10 2020-06-30 13F Thermo Fisher Scientific COM 883556102 493,770 -212,286 -30.07 178,912 -10.65 1.0549
2020-05-05 2020-03-31 13F Thermo Fisher Scientific COM 883556102 706,056 -11,877 -1.65 200,237 -14.15 1.3564
2020-02-07 2019-12-31 13F Thermo Fisher Scientific COM 883556102 717,933 -6,878 -0.95 233,235 10.48 1.1708
2019-10-30 2019-09-30 13F Thermo Fisher Scientific COM 883556102 724,811 -2,053 -0.28 211,116 -1.10 1.1227
2019-08-01 2019-06-30 13F Thermo Fisher Scientific COM 883556102 726,864 -6,153 -0.84 213,465 6.39 1.1416
2019-04-30 2019-03-31 13F Thermo Fisher Scientific COM 883556102 733,017 -18,541 -2.47 200,641 19.29 1.1034
2019-02-11 2018-12-31 13F Thermo Fisher Scientific COM 883556102 751,558 -174,254 -18.82 168,191 -25.57 0.9869
2018-11-13 2018-09-30 13F Thermo Fisher Scientific COM 883556102 925,812 -172,817 -15.73 225,972 -0.70 1.1261
2018-08-07 2018-06-30 13F Thermo Fisher Scientific COM 883556102 1,098,629 11,013 1.01 227,570 1.35 1.1682
2018-05-02 2018-03-31 13F Thermo Fisher Scientific COM 883556102 1,087,616 -13,411 -1.22 224,549 7.41 1.1493
2018-02-06 2017-12-31 13F Thermo Fisher Scientific COM 883556102 1,101,027 25,423 2.36 209,063 2.73 1.0477
2017-10-18 2017-09-30 13F Thermo Fisher Scientific COM 883556102 1,075,604 360,911 50.50 203,504 63.21 1.0718
2017-07-26 2017-06-30 13F Thermo Fisher Scientific COM 883556102 714,693 66,097 10.19 124,692 25.16 0.6727
2017-05-02 2017-03-31 13F Thermo Fisher Scientific COM 883556102 648,596 1,094 0.17 99,624 9.04 0.5578
2017-02-10 2016-12-31 13F Thermo Fisher Scientific COM 883556102 647,502 95,825 17.37 91,363 4.12 0.5303
2016-11-09 2016-09-30 13F Thermo Fisher Scientific COM 883556102 551,677 -22,388 -3.90 87,750 3.45 0.5423
2016-08-10 2016-06-30 13F Thermo Fisher Scientific COM 883556102 574,065 -6,857 -1.18 84,824 3.13 0.5358
2016-05-12 2016-03-31 13F Thermo Fisher Scientific COM 883556102 580,922 580,922 82,253 0.5239
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.